Neuron name service: reset request queue on error

Otherwise, the name service can't make any new request once it
encountered a problem. If users need to re-login because of a stale
session, the neuron name service remained broken, despite a successful
login. This is fixed now by resetting the name service request queeu on
failure.

See #2284

Author: tomka

django/applications/catmaid/static/libs/catmaid/neuron_name_service.js

@@ -868,7 +868,12 @@
                   .then(resolve)
                   .catch(reject);
               }
-            }));
+            }))
+            .catch(error => {
+              // Reset queue
+              activeUpdate = Promise.resolve();
+              return Promise.reject(error);
+            });
           return activeUpdate;
         },